A new cable-free bidirectional data transmission device for water injection wells

Abstract

This patent discloses a new cableless bidirectional data transmission device for water injection wells, which can realize the bidirectional transmission of data such as flow rate and pressure from the wellhead of the water injection well to the downhole injection layer, and from the downhole injection layer to the wellhead, and uses time series waves for encoding. The device is composed of an upper joint, an outer protective tube, a pressure control nipple, a faucet nipple, a circuit control nipple, a middle joint and a lower joint. The upper joint and the lower joint are connected to the outer protective pipe through threads; There are pressure control shorts, faucet shorts and circuit control shorts; the circuit control shorts contain flow sensors, pressure sensors, battery components and logic control calculation circuits; the injected water first enters the formation through the quick opening / closing valve and the faucet shorts . The time-series pressure wave means that the signal code is determined by the time, and the decimal system is used. The timing starts when the signal becomes low level. If it becomes high level after N time units, the signal represents the number N. On the one hand, the present invention realizes the non-contact two-way transmission of data, on the other hand, it adopts the form of time series wave to encode, combined with the design method of fast opening / closing valve, it can greatly improve the encoding, decoding and transmission efficiency of pressure wave.

Description

technical field [0001] The invention relates to the field of layered water injection technology for oilfield water injection wells, and in particular to an electromechanical integrated tool with the ultimate goal of controlling the water injection volume, which can realize two-way transmission of flow, pressure and other data functions from the surface wellhead to the downhole, and from the underground to the surface wellhead. Background technique [0002] In order to improve the economic benefits of oil field development and maximize the oil recovery rate, layered water flooding is often used in oil field development to supplement the capacity of the reservoir, injecting water into the well, so as to produce more oil at the production end of the oil well. At present, there are many layered water injection techniques and tools in the oil field, including the method of using steel wire / cable to obtain downhole flow data, and the method of using pressure change to load informat...

AI Technical Summary

Problems solved by technology

However, the aforementioned layered water injection tools face the following problems: the former uses ground equipment to lower the instrument into the well, which increases the operating cost and needs to occupy a limited operating site, especially bringing a greater load to offshore platform construction; the latter mentioned The water injection tool does not have the function of transmitting data from downhole to the surface wellhead, and the transmission efficiency is low

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